Hot-air furnace



Feb. 5 1924.

G. A. GERMAIN ET AL.

HOT AIR' FURNACE Filed Sept. 20. 51322 2 Sheets-Sheet 1 G. A. GERMAIN ET AL Feb. 5

HOT AIR FURNACE Filed Sept. 20 1922 q, IEFIVHH g 1 l-H I 4 1 Patented Feb. 5, 1924.

UNITED STATES PATENT OFFICE.

GEORGE A. GERMAIN AND JOHN "W. GELLENBECK, OF ST. PAUL, MINNESOTA.

HOT-AIR FURNACE.

Application filed September 20, 1922.

To all whom it may concern Be it known that we, GEORGE A. GERMAIN and JOHN W. GELLENBEGK, citizens of the United States, residing at St. Paul in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Hot-Air Furnaces, of which the following is a specification.

Our invention relates to hot air furnaces and heaters, and the main object is to provide a hot air furnace with heat transmitting surfaces which are enlarged by being corrugated. Other improvements will further appear from the specification and claims to follow.

In the accompanying drawings;

Fig. l is a top view of the improved furnace with the right hand half of the top of the hot air jacket removed as on line 11 in Fig. 2.

Fig. 2 is a side elevation of the upper portion of the furnace and the jacket around it.

Fig. 3 is a partly sectional side elevation of the whole apparatus.

Fig. 4 is a section on the line 44 in Fig. 1 showing on a reduced scale some structure not fully shown in the other views.

Fig. 5 is a section on the line 55 in Fi 3.

Feferring to the drawings by reference numerals, 1O designates the regular hot air jacket from which the hot air is delivered through pipes 11 into the rooms of a buildin to be heated.

paced within the jacket 10 is the furnace and radiating means which in this case consists of an upright, cylindrical, corrugated body or shell 12 having a plain top or dome 13. The front side of the shell is provided with a fuel inlet 14 having a door 15, draft intakes 16 with a door 17, and a door 18 leading into the ash pit 19 and having a smaller door 20 for intake of air to the grate 21 located in the base of the fire pot in which fuel 22 is burning. Said fire pot is formed of the adjacent portion of the shell 12 and a cylindrical tile lining 23 having horizontal grooves 0r ducts 24, 25, 26 with perforations 27 for air to pass through into the fuel and vertical grooves or ducts 28, connecting the horizontal ducts. The ducts 24 receive the air from the intakes 16 and deliver it into all the other grooves or ducts 24, 25, 26, 28 and air holes 27. An air inlet Serial No. 583,438.

door 15" and all the doors 15, 17, 18, 20 are mounted on a vertical front plate 29 joining the front edges of the jacket 10. In the upper portion of said front plate is inserted a water pan 30 having a lid 31. Said pan has its uncovered main portion of segmental form, as best shown in Fig. 1, and isof a comparatively large size so as to insure the desired moisture or humidity of the air in the jacket. The jacket itself may receive its air through large inlets 32 in its base 33 or through lateral intake openings (not shown).

The base 33 may have radial arms 34 (see Fig. 1) secured at 35 to the shell 12, and secured at 36 upon the base are two supports each with a vertical ratchet toothed surface 38 contacting with the ratchet toothed side 39 of a clamp 40, in which is secured by screws 41 a segmentally curved corrugated radiator drum 42. The depending portion of each clamp is provided with a vertical slot 43 (see Fig. 4) so as to be slidable on a bolt 44 extending through it from the support 37. Said boltv has a spring washer 45 and a nut 46 which hold the ratchet racks 38, 39 engaged in such a manner that when the radiator is gradually raised by the permanent expansion of the furnace shell 12 and other parts the rack 39 will slide upward and engage higher and higher teeth of ratchet 38. Contraction by cooling the parts is not here to be considered but only the well known trouble of permanent expansion or growing as furnace men term it, when the expanded parts remain enlarged after being repeatedly heated and receiving ashes and other fine dirt into the expanded pores.

As best shown in Fig. 1 the radiating drum 42 is corrugated so as to contain a large surface in a small space, and is connected by a pipe 47 to the combustion chamber 48, while opposite therefrom and further down it has an outlet pipe 49 extending through the jacket and leading into a chim ney (not shown).

The radiator 42 is also provided with baffle plates 50 joined together at a point as 51 between the pipes 47 and 49 and slanting downwardly toward their ends 52, where they, for better effect, may have vertical portions 53 (shown in Fig. 4 only). Beyond and below said baffle plates the radiator is provided with clean out ducts 54 but the fresh air from doors 17 gets heated r in the ducts 24, 25, 26, 28 and entering the fire through; the apertures 27, causes the fuel to give off and burn its gases with a maxi um" heating effect in the combustion chamber 48, whereby the corrugated body f,Sll6llj12 transmits much heat to the, air

inthe jacket. And still more heat is trans mitted, to said air from the large corrugated surface, of the radiator 42, the latter being most effectively heated by the hot air pass ing as arrows 5.6-57-58 through it.

he clean out doors 55, being one in each side. ofthe apparatus, enable one to readily clean out the soot from the entire inside of the radiator 42.

What w e claim-isz 1. Ina furnace, ,the combination with a base, a furnace body secured to thebase, a radiator secured with its upper portion to thefurnace body, one or more devices supporting the lower end of the radiator, each ofsaid devices composedof twomembers secured one to the base, the other to the radiator and havin each a vertical ratchet rack arranged to slide on the teeth of the other rack, one of said racks having a vertical slot, the other having a bolt movable in the slot and provided with a spring'washer and a nut for holding the racks engaged in a manner allowing them to slide automatically on each other when subjected to a certain degree of'force.

2. A hot air furnace comprising an air jacket having arear aperture and two apertures, one at'each side, a furnace body in the jacket, a radiator having an upper pipe connecting itwith the upper portion of the furnace body and another and alower pipe directed outof the rear outlet of the jacket, and'oppositely directed clean out tubes one in each side aperture of the jacket, and closures for said clean out tubes and two bafile plates in the radiator and adjoining each other at a'point near below the upper tube and slanting downward in opposite directions each one to a point adj aoent one of the clean out tubes.

3. The structure specified in claim 1, said bafiie plates having their outer ends extended verticallydownward for some distance.

In testimony whereof we afiix our signatures.

GEORGE, A. GERMAIN.

J OHN W; GELLENBEQK. 

